On 11/24/2015 5:30 AM, Ive wrote:
> Am 11/22/2015 um 20:55 schrieb Mike Horvath:
>> I am trying to re-render the Munsell color cylinder scene from the
>> object collection. However, the results look too drab. Compare it to
>> this:
>>
>> https://commons.wikimedia.org/wiki/File:Munsell_1929_color_solid.png
>>
>> Does anyone have any tips to improve the render?
>>
>>
>
>
> As Cousin Ricky did dig up that this xyY data uses illuminant C you need
> to "tell" this CIE.inc otherwise you won't get the hues right.
> There is the macro CIE_ReferenceWhite() for exactly this purpose. The
> CIE.inc default is D50 (not D65!) as all reflectance data that
> accompanies lightsys uses D50 (and all spectrophotometer I am aware of).
> Anyway, a call to CIE_ReferenceWhite with the appropriate illuminant
> will result in a recalculation of the chromatic adaption matrices and
> the xyz->rgb transformation matrices.
>

Okay thanks!

> For the washed out look of your render itself, if you want to reproduce
> the image of the wikipedia page: there is the 3d shading look just faked
> (by making the block sides slightly darker than the tops) so no GI and
> not even a light source is used. This makes sense because the focus of
> this image is the hue of the Munsell colors.
>

The problem is that POV 3.6 and 3.7 produce totally different results, 
even when using #version 3.6.

> -Ive (who once wrote CIE.inc but is meanwhile retired and ATM quite
> addicted to Dota2)
>
>
>
>

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